Mesoporous composite oxide catalyst, method for preparing the same and method for synthesizing 1,3-butadiene using the same

Patent metadata

Field	Value
Publication number	US-9782765-B2
Application number	US-201414418027-A
Country	US
Kind code	B2
Filing date	May 2, 2014
Priority date	May 6, 2013
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

Disclosed are a mesoporous composite oxide catalyst, a method for preparing the same and a method for synthesizing 1,3-butadidne using the same. The surface area is increased by introducing certain porous silica into preparation of a catalyst for synthesizing 1,3-butadiene, thereby improving a conversion ratio of normal-butene, and selectivity and yield of 1,3-butadiene, and providing economic efficiency from the viewpoint of decreasing an amount of used metal and reducing catalyst production cost.

First claim

What is claimed is:

1. A method for synthesizing 1,3-butadiene, comprising: oxidatively dehydrogenating normal-butene in the presence of a mesoporous composite metal oxide catalyst to produce 1,3-butadiene,
wherein:
the mesoporous composite metal oxide catalyst is represented by the following Formula 1:
(x %)Mo a Bi b Fe c Co d E e O y +(100−x)% SiO 2   [Formula 1]

wherein E is at least one element selected from Group I elements on the periodic table, a is 0.001 to 13, b, c, d and e are each independently 0.001 to 10, x is an integer of 30 to 60, and y is a value determined by other components for adjusting a valance;
the mesoporous composite metal oxide catalyst has a surface area of 50 to 900 m 2 /g and;
the mesoporous composite metal oxide catalyst has pores, an average pore volume of the pores is 0.01 to 2 cm 3 /g and an average pore size is 2 to 50 nm.

2. The method according to claim 1 , wherein the oxidative dehydrogenation is carried out by reacting a reactant containing normal-butene, oxygen, nitrogen and steam at molar ratios of 1:0.5 to 2:2 to 20:5 to 20 in the presence of the mesoporous composite metal oxide catalyst at a reaction temperature of 250 to 350° C. and at a space velocity of 50 to 5,000 h −1 .

3. The method of claim 1 , wherein the mesoporous composite metal oxide catalyst is charged as a fixed bed in a metal tubular reactor or a shell-tube reactor containing multiple fixed tubes.

4. The method of claim 1 , further comprising pretreating the catalyst at 400° C. for 2 hours under an air atmosphere.

5. The method of claim 3 , wherein the catalyst is present in the reactor as a layer and the reactants are continuously injected into the catalyst layer while maintaining a reaction temperature at 320° C.

6. The method of claim 1 , wherein the oxidative dehydrogenation is carried out at a space velocity of from 50 to 250 h −1 .

7. The method of claim 1 , wherein the SiO 2 is a porous silica having an average pore size of 2 to 10 nm and a surface area of 500 to 1,400 m 2 /g.

8. The method of claim 1 , wherein the SiO 2 has an MCM-41 type of crystal structure.

9. The method of claim 1 , wherein the SiO 2 has a SBA-15 type of crystal structure.

10. The method of claim 1 , wherein the mesoporous composite metal oxide catalyst has an average pore volume of 0.01 to 1.5 cm 3 /g and an average pore size of 2 to 10 nm.

11. The method of claim 1 , wherein the mesoporous composite metal oxide catalyst has an average pore volume of 0.03 to 1 cm 3 /g, an average pore size of 2 to 5 nm, and a surface area of 83 to 879 m 2 /g.

12. The method of claim 1 , further comprising a purification process comprising absorbing the 1,3-butadiene using a solvent to separate 1,3-butadiene from nitrogen and oxygen.

13. The method of claim 12 , further comprising a degassing process to remove gas and by-products from the solvent.

14. The method of claim 12 , further comprising a separation process to separate the 1,3-butadiene from the solvent.

Assignees

• Lg Chemical Ltd

Inventors

• Suh Myung Ji
• Ko Dong Hyun
• Cha Kyong Yong
• Kang Jun Han
• Kim Dae Chul
• Nam Hyun Seok
• Choi Dae Heung

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• B01J23/8872

  Alkali or alkaline earth metals · CPC title

• B01J2523/13

  Potassium · CPC title

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title